A new mathematical model and control of a three-phase AC-DC voltage source converter

Blasko, V.; Kaura, V.

doi:10.1109/63.554176

Cited by 776 publications

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“…As a promising technology, the control of STATCOM has been discussed in many literatures [7][8][9][10]. In this paper, the damping of torsional oscillations using STATCOM, connected at the middle bus is studied.…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid Fuzzy/LQR Based Oscillation Damping Controller Using 3-level STATCOM

Ajami¹,

Taheri²

2011

IJCEE

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I. INTRODUCTIONFixed series capacitors have long been used in power systems as a cost-effective option for enhancing power transfer capability of HV transmission systems. However, the series capacitor has caused shaft damage in multistage steam turbine system in couple of occasions through subsynchronous resonance (SSR). SSR is an electric power system condition where the electric network exchanges energy with a turbine generator at one or more of the natural frequencies of the combined system under the subsynchronous frequency of the system [1]. This leads to turbine-generator shaft failure and system instability.Rotor oscillations of generator at a torsion mode frequency, (fm) induce armature voltage components at frequencies (fern) given by:(1) When the subsynchronous component fern is close to electrical resonant frequency, the subsynchronous torques produced by subsynchronous voltage components can be Manuscript received June 8, 2010. Ali Ajami is with the electrical engineering department of Azarbaijan university of Tarbiat Moallem, Tabriz, Iran, phone: +98-914-3183362; fax: +98-412-4327548; e-mail: ajami@azaruniv.edu Naser Taheri is with the electrical engineering department of, Islamic Azad University, Quchan Branch, Iran, e-mail: N.Taheri.1362@gmail.com sustained. This interplay between electrical and mechanical systems is termed as torsional oscillations [2].Flexible AC Transmission Systems (FACTS) technology is an important tool for permitting existing transmission facilities to be loaded, at least under contingency situations, up to their thermal limits without degrading system security [3][4][5][6]. The most striking feature is the ability to directly control transmission line flows by structurally changing parameters of the grid and to implement high-gain type controllers, based on fast switching.The uses of FACTS devices like STATCOM are increasing in the network for enhancing power transfer, voltage stability and damping of power oscillations. As a promising technology, the control of STATCOM has been discussed in many literatures [7][8][9][10]. In this paper, the damping of torsional oscillations using STATCOM, connected at the middle bus is studied. A supplementary fuzzy control signal is added to control circuit to damping oscillations caused by series compensator capacitance. To improve STATCOM controller, hybrid Fuzzy/LQR controller is proposed. II. DYNAMIC MODELLING OF STATCOMThe system considered is an IEEE benchmark used to study subsynchronous resonance. The modeling aspects of the electromechanical system are given in detail in reference [11]. This system is shown in Fig.1. One convenient method for studying balanced three-phase system (especially in synchronous machine problems) is to convert the three phase voltages and currents into synchronous rotating frame by abc/dq transformation. Computer and Electrical Engineering, Vol. 3, No. 2, April, 2011 1793-8163 185 are decoupled so that the use of classic control method is possible, and even more physical meaning for each control...

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Section: Introductionmentioning

confidence: 99%

“…Equations (2) to (4) give the mathematical expression of the STATCOM shown in Fig 1. Fig.2 illustrates the detailed control block diagram of STATCOM according to dynamic equations [13][14][15][16][17]. …”

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confidence: 99%

A Hybrid Fuzzy/LQR Based Oscillation Damping Controller Using 3-level STATCOM

Ajami¹,

Taheri²

2011

IJCEE

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“…Automatic control of power flow between stations is the result of a constant DC voltage source gives -slack bus‖. [6]. AC voltage control and reactive power control will be switched as per the requirement.…”

Section: Introductionmentioning

confidence: 99%

“…Both classical and VSC-HVDC are used for the applications like long distance transmission, underground and undersea cable transmission and interconnection of asynchronous networks. [6]. Thyristor based classical HVDC mostly used for point to point large power transmission long distance over land or undersea cables [20].…”

Section: Introductionmentioning

confidence: 99%

Optimal Configuration of Converter for HVDC Transmission System

2016

IJSR

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A novel method is proposed for configuring a power electronics converter circuit for optimal performance in HVDC transmission system. It is configured depending upon the desired output voltage pulses. Assuming high number of pulses in output voltage optimal configuration is obtained by achieving maximum possible output voltage, minimum Peak Inverse Voltage, and by obtaining transformer utilization factor value near unity. This paper suggests an analytical way of designing the converter circuit based on certain assumptions. A mathematical model of the scheme is developed. Detailed analysis and simulation results are presented in LabVIEW 7.1 software.

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“…A common simplification is to linearise the switching circuit by creating a small-signal model and to consider the average behaviour of the switched circuit over a period. A small sample of the literature includes: DC/DC converters [7], AC/DC converters [8][9][10], DC/AC converters [11][12][13][14] and FACTS devices [15].…”

Section: Introductionmentioning

confidence: 99%

State-space model of grid-connected inverters under current control mode

Kroutikova

Hernandez-Aramburo

Green

2007

IET Electr. Power Appl.

163

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The growth of distributed generation has led to distribution systems with a mixture of rotating machine generators and inverter interfaced generators. The stability of such networks needs to be studied through analysis of state-space models and so suitable models of inverters are needed to complement the well established models of rotating machines. Just as machine models include features such as automatic voltage regulators and wash-out functions so too should the inverter model include phase-locking functions and internal control loops.This paper develops the model for voltage source inverters with an internal current control loop, an outer power regulation loop, a measurement of average power and a phase-locked loop. The model is presented in detail and is formed with a state-vector similar to that used for rotating machines. The model includes non-linear terms but can be linearised about an operating point. The state-space model is verified against a component-level time-step simulation in Simulink/PLECS.

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A new mathematical model and control of a three-phase AC-DC voltage source converter

Cited by 776 publications

References 6 publications

A Hybrid Fuzzy/LQR Based Oscillation Damping Controller Using 3-level STATCOM

A Hybrid Fuzzy/LQR Based Oscillation Damping Controller Using 3-level STATCOM

Optimal Configuration of Converter for HVDC Transmission System

State-space model of grid-connected inverters under current control mode

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